("Linked List after removal of the head using pollFirst() : " + list) ("Head of the list is : " + list.pollFirst()) We will simply call the list.pollFirst() to use this method.Įxplanation: As we can see, after using list.pollFirst(), the first element of the list is deleted and returned. It, too, returns and removes the head (first element) of the list. The pollFirst() method is very similar to the poll() method. Space Complexity: O(1), as no extra space is required. Time Complexity: O(1), as we are only accessing the head of the list. Linked List after removal of head using poll() : ("Linked List after removal of head using poll() : " + list) ("Head of the list is : " + list.poll()) ("The initial Linked List is : " + list) Įxplanation: As we can see, after using list.poll(), the head of the list is displayed and deleted from the list. Output: 1 is displayed, and the resultant list is. Return Value: This function returns the first element (head) of the linked list if there are elements in the list, and if the list is empty, it returns null. This method deletes the head of the list and returns it. We will discuss all of them in detail in this article. There are 3 different variation of poll() function. This function deletes the elements at the front of the container and returns it, and so it has a wide range of applications in day-to-day problems and competitive programming. Poll is a method in Java’s Linked list class that enables Queue Based functioning. In a coding interview, having a thorough understanding of Linked Lists might be a major benefit. One of the most crucial data structures to learn while preparing for interviews is the linked list.
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